A problem with the ground being wet is that the wheels of the mower can sink into the wet ground, forming ruts in the lawn. Mow grass only when it's dry. Mowing grass when it's wet usually produces a very uneven cut. The wet grass clippings can also clump leaving a mess on the lawn and underneath your mower. Much more difficult to mow. The rotor not only has to cut the grass, but move the water as well.
Familial Pattern And Genetics: There is strong evidence that major depression is, in part, a genetic disorder: Individuals who have parents or siblings with Major Depressive Disorder have a 1.5-3 times higher risk of developing this disorder.
That is the case for major depression. Heritability is probably 40-50%, and might be higher for severe depression. This could mean that in most cases of depression, around 50% of the cause is genetic, and around 50% is unrelated to genes (psychological or physical factors). Or it could mean that in some cases, the tendency to become depressed is almost completely genetic, and in other cases it is not really genetic at all.